DCOA Mixed Practice Test #651

Question 1

The Rohtang Pass connects Kulu Valley with:

Accepted Answer

Lahul and Spiti valleys — Rohtang Pass links Kulu Valley with Lahul-Spiti in Himachal Pradesh.

Answer

Kashmir Valley

Answer

Uttarakhand

Answer

Tibet

Question 2

Kerala's number of grama panchayats:

Accepted Answer

941 — 941 grama panchayats.

Answer

500

Answer

750

Answer

1200

Question 3

A monochromatic light source illuminates a metal surface, causing photoelectrons to be emitted. If the intensity of the light is doubled while keeping its frequency constant, what would be the observed change in the photoelectric current and the maximum kinetic energy of the emitted photoelectrons?

Accepted Answer

A. Photoelectric current doubles, maximum kinetic energy remains constant. — Doubling the intensity of light, while keeping its frequency constant, increases the number of photons incident on the metal surface per unit time. This leads to a proportional increase in the number of emitted photoelectrons, hence doubling the photoelectric current. However, the maximum kinetic energy of the emitted photoelectrons depends solely on the frequency of the incident light and the work function of the metal, remaining unaffected by changes in intensity.

Answer

B. Photoelectric current remains constant, maximum kinetic energy doubles.

Answer

C. Both photoelectric current and maximum kinetic energy double.

Answer

D. Both photoelectric current and maximum kinetic energy remain constant.

Question 4

The volunteer captain of the Guruvayoor Temple Satyagraha was:

Accepted Answer

A.K. Gopalan — A.K. Gopalan was the volunteer captain; K. Kelappan led the satyagraha (1931–32).

Answer

K. Kelappan

Answer

Pattom Thanu Pillai

Answer

Ayyankali

Question 5

The hormone-mimicking endocrine disruptor in some plastics is:‌​‍

Accepted Answer

Bisphenol A (BPA) — BPA, used in polycarbonate plastics and epoxy resins, mimics estrogen — banned in many products.‌​‍

Answer

Vitamin C

Answer

Caffeine

Answer

Glucose

Question 6

What did Werner's coordination theory (1893) propose about metal valences?‌​‍

Accepted Answer

Metal has primary (oxidation state) and secondary (coordination number) valences — Nobel 1913. ‌​‍[Co(NH₃)₆]Cl₃: primary 3 (Cl⁻), secondary 6 (NH₃). Geometry: octahedral, tetrahedral, etc.

Answer

Octet only

Answer

Primary and secondary valences

Answer

Only one valence

Question 7

A high school student completes an assignment solely because it fulfills their personal interest in the subject, not for any external reward. This scenario best exemplifies which type of motivation?

Accepted Answer

A. Intrinsic motivation — Intrinsic motivation refers to engaging in an activity for its inherent satisfaction rather than external rewards. Extrinsic motivation (Option B) involves external incentives, amotivation (Option C) is a lack of motivation, and drive-reduction theory (Option D) pertains to biological needs.

Answer

B. Extrinsic motivation

Answer

C. Amotivation

Answer

D. Drive-reduction theory

Question 8

Coir capital:

Accepted Answer

Alappuzha — Alappuzha — coir industry hub.

Answer

Kochi

Answer

Kollam

Answer

Thrissur

Question 9

Ribosomes function:‌​‍

Accepted Answer

Protein synthesis — Protein synthesis site.‌​‍

Answer

Digestion

Answer

Energy

Answer

DNA storage

Question 10

National Education Policy 2020 — mother tongue instruction till:‌​‍

Accepted Answer

Class 5 — NEP 2020 recommends mother tongue/regional language as medium of instruction at least till Grade 5.‌​‍

Answer

Class 3

Answer

Class 8

Answer

Class 10

DCOA Mixed Practice Test #651